data_global _chemical_name_mineral 'Roumaite' loop_ _publ_author_name 'Biagioni C' 'Bonaccorsi E' 'Merlino S' 'Parodi G C' 'Perchiazzi N' 'Chevrier V' 'Bersani D' _journal_name_full 'The Canadian Mineralogist' _journal_volume 48 _journal_year 2010 _journal_page_first 17 _journal_page_last 28 _publ_section_title ; Roumaite, (Ca,Na)3(Ca,REE,Na)4(Nb,Ti)[Si2O7]2(OH)F3, from Rouma Island, Los Archipelago, Guinea: A new mineral species related to dovyrenite ; _database_code_amcsd 0006312 _chemical_compound_source 'Rouma Island, Los Archipelago, Guinea' _chemical_formula_sum 'Ca3.19 Na2.07 Ce1.22 (Nb.55 Ti.45) Si4 O15 (F3 H)' _cell_length_a 7.473 _cell_length_b 11.294 _cell_length_c 18.778 _cell_angle_alpha 90 _cell_angle_beta 101.60 _cell_angle_gamma 90 _cell_volume 1552.494 _exptl_crystal_density_diffrn 3.548 _symmetry_space_group_name_H-M 'C 1 c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv CaM2 0.74290 0.87550 0.47960 0.46000 0.01890 NaM2 0.74290 0.87550 0.47960 0.30000 0.01890 CaM3 0.99030 0.87510 0.97990 0.60000 0.02790 NaM3 0.99030 0.87510 0.97990 0.15000 0.02790 NaM4 0.98960 0.37530 0.98030 0.60000 0.02760 CaM4 0.98960 0.37530 0.98030 0.35000 0.02760 CeM5 0.64360 0.70560 0.28940 0.60000 0.00840 NaM5 0.64360 0.70560 0.28940 0.40000 0.00840 CaM6 0.33550 0.45240 0.16830 0.65000 0.00460 CeM6 0.33550 0.45240 0.16830 0.17500 0.00460 NaM6 0.33550 0.45240 0.16830 0.17500 0.00460 CaM7 0.63900 0.79380 0.78620 0.68000 0.00860 CeM7 0.63900 0.79380 0.78620 0.17000 0.00860 NaM7 0.63900 0.79380 0.78620 0.17000 0.00860 CaM8 0.33380 0.95500 0.17080 0.45000 0.00460 CeM8 0.33380 0.95500 0.17080 0.27500 0.00460 NaM8 0.33380 0.95500 0.17080 0.27500 0.00460 NbM1 0.73540 0.62740 0.97690 0.55000 0.02580 TiM1 0.73540 0.62740 0.97690 0.45000 0.02580 Si1 0.08320 0.69980 0.11760 1.00000 0.01680 Si2 0.52150 0.70050 0.11840 1.00000 0.00750 Si3 0.88070 0.95440 0.33980 1.00000 0.00950 Si4 0.44770 0.95300 0.34000 1.00000 0.01470 O1 0.39460 0.65590 0.79170 1.00000 0.02230 O2 0.39300 0.07510 0.30040 1.00000 0.01590 O3 0.67650 0.94570 0.36100 1.00000 0.01890 O4 0.51840 0.55260 0.91890 1.00000 0.01800 O5 0.09100 0.58790 0.17000 1.00000 0.00040 O6 0.38490 0.84250 0.29240 1.00000 0.02000 O7 0.39830 0.57670 0.30170 1.00000 0.01290 O8 0.29620 0.70230 0.09660 1.00000 0.02080 O9 0.59320 0.81670 0.16800 1.00000 0.00220 O10 0.39170 0.94980 0.41990 1.00000 0.02240 O11 0.08830 0.81650 0.16590 1.00000 0.00420 O12 0.95550 0.69620 0.03840 1.00000 0.00680 O13 0.57780 0.69720 0.04000 1.00000 0.00860 O14 0.59600 0.58980 0.17180 1.00000 0.00140 F1 0.76570 0.47750 0.03970 0.75000 0.01760 O-H1 0.76570 0.47750 0.03970 0.25000 0.01760 F2 0.70310 0.70610 0.41600 0.75000 0.01540 O-H2 0.70310 0.70610 0.41600 0.25000 0.01540 F3 0.70180 0.76890 0.91400 0.75000 0.01640 O-H3 0.70180 0.76890 0.91400 0.25000 0.01640 F4 0.26970 0.45440 0.03970 0.75000 0.01480 O-H4 0.26970 0.45440 0.03970 0.25000 0.01480